for three months. but this was a real dp perexper a jufrpg food binge in the name of science y some people get diabetes or hypertension when they gain and some don't. here is john donvan. >> two sausage buttery burr ti- >> a number three. >> he goes to the drive-thru. again and again. and again. >> thank you very much. >> and why? for science. dave giocolo is a guinea pig of sorts. back up a few months, put dave in his car and here was the heaad he heard. >> this study includes a short term high coalorie diet and the diet program. >> reporter: offering to pay people to add fat to their own bodies, adding an extra meal each day, 1,000 calories worth of fast food and a lot of people came forward. like dave. a salesman. >> once i got into work i called right away and i tried to e-mail them. >> reporter: for what? research. >> you can see this is x-ray slice through the abdomen where you can see the thick rim of fat around the outside. >> reporter: the doctor wanted to find out why only some people who gain weight also get diabetes and hypertension and others do not something he could not res
